extends Light2D


onready var viewport: Viewport = $Viewport


func _process(delta: float) -> void:
	var main_viewport = get_viewport()
	if viewport.canvas_transform != main_viewport.canvas_transform:
		viewport.canvas_transform = main_viewport.canvas_transform
		transform = main_viewport.canvas_transform.inverse()
		viewport.render_target_update_mode = Viewport.UPDATE_ONCE


func add_stain(stain: Node2D) -> void:
	viewport.add_child(stain)
	viewport.render_target_update_mode = Viewport.UPDATE_ONCE